| 摘要 |
The invention relates to a method for checking the tightness of a vessel and especially of a tank-venting system of a motor vehicle. In the method, at least a reference leak (42) or the vessel is subjected to an overpressure or underpressure with at least one pressure source. At least one characteristic variable of the pressure source is determined (reference measurement or diagnostic measurement) and these characteristic variables are compared to each other and a conclusion is drawn as to the presence of a leak from the result of the comparison. The pumping power of the at least one pressure source is changed during the reference measurement and/or during the diagnostic measurement.
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